1 /* 2 * Copyright (c) 2015 Gooogle, Inc 3 * Written by Simon Glass <sjg@chromium.org> 4 * 5 * SPDX-License-Identifier: GPL-2.0+ 6 */ 7 8 #ifndef _ASM_SIPI_H 9 #define _ASM_SIPI_H 10 11 #define AP_DEFAULT_BASE 0x30000 12 #define AP_DEFAULT_SIZE 0x10000 13 14 #ifndef __ASSEMBLER__ 15 16 /** 17 * struct sipi_params_16bit - 16-bit SIPI entry-point parameters 18 * 19 * These are set up in the same space as the SIPI 16-bit code so that each AP 20 * can access the parameters when it boots. 21 * 22 * Each of these must be set up for the AP to boot, except @segment which is 23 * set in the assembly code. 24 * 25 * @ap_start: 32-bit SIPI entry point for U-Boot 26 * @segment: Code segment for U-Boot 27 * @pad: Padding (not used) 28 * @gdt_limit: U-Boot GDT limit (X86_GDT_SIZE - 1) 29 * @gdt: U-Boot GDT (gd->arch.gdt) 30 * @unused: Not used 31 */ 32 struct __packed sipi_params_16bit { 33 u32 ap_start; 34 u16 segment; 35 u16 pad; 36 u16 gdt_limit; 37 u32 gdt; 38 u16 unused; 39 }; 40 41 /** 42 * struct sipi_params - 32-bit SIP entry-point parameters 43 * 44 * These are used by the AP init code and must be set up before the APs start. 45 * The members must match with the sipi_params layout in sipi_vector.S. 46 * 47 * The stack area extends down from @stack_top, with @stack_size allocated 48 * for each AP. 49 * 50 * @idt_ptr: Interrupt descriptor table pointer 51 * @stack_top: Top of the AP stack area 52 * @stack_size: Size of each AP's stack 53 * @microcode_lock: Used to ensure only one AP loads microcode at once 54 * 0xffffffff enables parallel loading. 55 * @microcode_ptr: Pointer to microcode, or 0 if none 56 * @msr_table_ptr: Pointer to saved MSRs, a list of struct saved_msr 57 * @msr_count: Number of saved MSRs 58 * @c_handler: C function to call once early init is complete 59 * @ap_count: Shared atomic value to allocate CPU indexes 60 */ 61 struct sipi_params { 62 u32 idt_ptr; 63 u32 stack_top; 64 u32 stack_size; 65 u32 microcode_lock; 66 u32 microcode_ptr; 67 u32 msr_table_ptr; 68 u32 msr_count; 69 u32 c_handler; 70 atomic_t ap_count; 71 }; 72 73 /* 16-bit AP entry point */ 74 void ap_start16(void); 75 76 /* end of 16-bit code/data, marks the region to be copied to SIP vector */ 77 void ap_start16_code_end(void); 78 79 /* 32-bit AP entry point */ 80 void ap_start(void); 81 82 extern char sipi_params_16bit[]; 83 extern char sipi_params[]; 84 85 #endif /* __ASSEMBLER__ */ 86 87 #endif 88